Metal Top.
Plastic Top.
Carbon Top.
Standard = Metal TopP = Plastic TopC = Carbon Top
Holed flange for Bosch sensor.Standard = Metal TopP = Plastic TopC = Carbon Top
Twin Air conical filter without flange.Standard = Metal TopP = Plastic TopC = Carbon Top
Standard = Metal TopP = Plastic Top
With 12° angled intake flange.Standard = Metal TopP = Plastic TopC = Carbon Top